To stably fix a stiffness treatment instrument, with which stiff conditions on shoulders or the like are relaxed, at the position of an effective spot for applying moxa for a long time.

A recessed part 5 of a pedestal 1 is fitted inside a shoulder strap, a hook 3 is closed, the shoulder strap is sandwiched with the pedestal 1, and the pedestal 1 is fixed inside the shoulder strap. In that fixing state, a metallic body 2 is held on the rear side of the shoulder strap by the pedestal 1, and the metallic body 1 presses the position of the effective spot for applying moxa on a human body.